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Sagot :
We have that the dilution equation of concentrated solutions will be equal to:
[tex]C_1V_1=C_2V_2[/tex]where,
C1 is the initial concentration of the solution = 7%
V1 is the initial volume = 400mL
C2 is the final concentration = 4.5%
V2 is the final volume = ?
We clear Ve and replace the known data:
[tex]\begin{gathered} V_2=\frac{C_1V_1}{C_2} \\ V_2=\frac{7\%\times400mL}{4.5\%}=622mL \end{gathered}[/tex]Answer: the new volume of the solution will be 622 mL
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